491 lines
16 KiB
PHP
491 lines
16 KiB
PHP
<?php
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/**
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* Metadata API
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*
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* Functions for retrieving and manipulating metadata of various WordPress object types. Metadata
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* for an object is a represented by a simple key-value pair. Objects may contain multiple
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* metadata entries that share the same key and differ only in their value.
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*
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* @package WordPress
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* @subpackage Meta
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* @since 2.9.0
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*/
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/**
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* Add metadata for the specified object.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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* @uses do_action() Calls 'added_{$meta_type}_meta' with meta_id of added metadata entry,
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* object ID, meta key, and meta value
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Metadata key
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* @param string $meta_value Metadata value
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* @param bool $unique Optional, default is false. Whether the specified metadata key should be
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* unique for the object. If true, and the object already has a value for the specified
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* metadata key, no change will be made
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* @return bool True on successful update, false on failure.
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*/
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function add_metadata($meta_type, $object_id, $meta_key, $meta_value, $unique = false) {
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if ( !$meta_type || !$meta_key )
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return false;
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if ( !$object_id = absint($object_id) )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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global $wpdb;
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$column = esc_sql($meta_type . '_id');
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// expected_slashed ($meta_key)
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$meta_key = stripslashes($meta_key);
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$meta_value = stripslashes_deep($meta_value);
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$check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique );
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if ( null !== $check )
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return (bool) $check;
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if ( $unique && $wpdb->get_var( $wpdb->prepare(
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"SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d",
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$meta_key, $object_id ) ) )
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return false;
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$_meta_value = $meta_value;
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$meta_value = maybe_serialize( $meta_value );
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do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value );
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$wpdb->insert( $table, array(
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$column => $object_id,
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'meta_key' => $meta_key,
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'meta_value' => $meta_value
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) );
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wp_cache_delete($object_id, $meta_type . '_meta');
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// users cache stores usermeta that must be cleared.
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if ( 'user' == $meta_type )
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clean_user_cache($object_id);
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do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $_meta_value );
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return true;
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}
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/**
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* Update metadata for the specified object. If no value already exists for the specified object
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* ID and metadata key, the metadata will be added.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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* @uses do_action() Calls 'update_{$meta_type}_meta' before updating metadata with meta_id of
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* metadata entry to update, object ID, meta key, and meta value
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* @uses do_action() Calls 'updated_{$meta_type}_meta' after updating metadata with meta_id of
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* updated metadata entry, object ID, meta key, and meta value
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Metadata key
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* @param string $meta_value Metadata value
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* @param string $prev_value Optional. If specified, only update existing metadata entries with
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* the specified value. Otherwise, update all entries.
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* @return bool True on successful update, false on failure.
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*/
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function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') {
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if ( !$meta_type || !$meta_key )
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return false;
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if ( !$object_id = absint($object_id) )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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global $wpdb;
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$column = esc_sql($meta_type . '_id');
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$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
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// expected_slashed ($meta_key)
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$meta_key = stripslashes($meta_key);
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$meta_value = stripslashes_deep($meta_value);
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$check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value );
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if ( null !== $check )
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return (bool) $check;
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if ( ! $meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ) )
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return add_metadata($meta_type, $object_id, $meta_key, $meta_value);
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// Compare existing value to new value if no prev value given and the key exists only once.
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if ( empty($prev_value) ) {
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$old_value = get_metadata($meta_type, $object_id, $meta_key);
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if ( count($old_value) == 1 ) {
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if ( $old_value[0] === $meta_value )
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return false;
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}
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}
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$_meta_value = $meta_value;
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$meta_value = maybe_serialize( $meta_value );
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$data = compact( 'meta_value' );
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$where = array( $column => $object_id, 'meta_key' => $meta_key );
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if ( !empty( $prev_value ) ) {
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$prev_value = maybe_serialize($prev_value);
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$where['meta_value'] = $prev_value;
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}
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do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
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$wpdb->update( $table, $data, $where );
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wp_cache_delete($object_id, $meta_type . '_meta');
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// users cache stores usermeta that must be cleared.
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if ( 'user' == $meta_type )
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clean_user_cache($object_id);
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do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
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return true;
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}
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/**
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* Delete metadata for the specified object.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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* @uses do_action() Calls 'deleted_{$meta_type}_meta' after deleting with meta_id of
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* deleted metadata entries, object ID, meta key, and meta value
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Metadata key
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* @param string $meta_value Optional. Metadata value. If specified, only delete metadata entries
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* with this value. Otherwise, delete all entries with the specified meta_key.
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* @param bool $delete_all Optional, default is false. If true, delete matching metadata entries
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* for all objects, ignoring the specified object_id. Otherwise, only delete matching
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* metadata entries for the specified object_id.
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* @return bool True on successful delete, false on failure.
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*/
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function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) {
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if ( !$meta_type || !$meta_key )
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return false;
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if ( (!$object_id = absint($object_id)) && !$delete_all )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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global $wpdb;
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$type_column = esc_sql($meta_type . '_id');
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$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
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// expected_slashed ($meta_key)
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$meta_key = stripslashes($meta_key);
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$meta_value = stripslashes_deep($meta_value);
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$check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all );
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if ( null !== $check )
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return (bool) $check;
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$_meta_value = $meta_value;
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$meta_value = maybe_serialize( $meta_value );
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$query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key );
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if ( !$delete_all )
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$query .= $wpdb->prepare(" AND $type_column = %d", $object_id );
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if ( $meta_value )
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$query .= $wpdb->prepare(" AND meta_value = %s", $meta_value );
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$meta_ids = $wpdb->get_col( $query );
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if ( !count( $meta_ids ) )
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return false;
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do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value );
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$query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )";
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$count = $wpdb->query($query);
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if ( !$count )
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return false;
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wp_cache_delete($object_id, $meta_type . '_meta');
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// users cache stores usermeta that must be cleared.
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if ( 'user' == $meta_type )
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clean_user_cache($object_id);
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do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value );
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return true;
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}
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/**
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* Retrieve metadata for the specified object.
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*
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* @since 2.9.0
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
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* the specified object.
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* @param bool $single Optional, default is false. If true, return only the first value of the
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* specified meta_key. This parameter has no effect if meta_key is not specified.
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* @return string|array Single metadata value, or array of values
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*/
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function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) {
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if ( !$meta_type )
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return false;
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if ( !$object_id = absint($object_id) )
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return false;
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$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single );
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if ( null !== $check ) {
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if ( $single && is_array( $check ) )
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return $check[0];
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else
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return $check;
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}
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$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');
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if ( !$meta_cache ) {
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update_meta_cache($meta_type, $object_id);
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$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');
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}
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if ( !$meta_key )
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return $meta_cache;
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if ( isset($meta_cache[$meta_key]) ) {
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if ( $single )
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return maybe_unserialize( $meta_cache[$meta_key][0] );
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else
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return array_map('maybe_unserialize', $meta_cache[$meta_key]);
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}
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if ($single)
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return '';
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else
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return array();
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}
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/**
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* Update the metadata cache for the specified objects.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int|array $object_ids array or comma delimited list of object IDs to update cache for
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* @return mixed Metadata cache for the specified objects, or false on failure.
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*/
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function update_meta_cache($meta_type, $object_ids) {
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if ( empty( $meta_type ) || empty( $object_ids ) )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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$column = esc_sql($meta_type . '_id');
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global $wpdb;
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if ( !is_array($object_ids) ) {
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$object_ids = preg_replace('|[^0-9,]|', '', $object_ids);
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$object_ids = explode(',', $object_ids);
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}
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$object_ids = array_map('intval', $object_ids);
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$cache_key = $meta_type . '_meta';
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$ids = array();
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foreach ( $object_ids as $id ) {
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if ( false === wp_cache_get($id, $cache_key) )
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$ids[] = $id;
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}
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if ( empty( $ids ) )
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return false;
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// Get meta info
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$id_list = join(',', $ids);
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$cache = array();
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$meta_list = $wpdb->get_results( $wpdb->prepare("SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list)",
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$meta_type), ARRAY_A );
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if ( !empty($meta_list) ) {
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foreach ( $meta_list as $metarow) {
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$mpid = intval($metarow[$column]);
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$mkey = $metarow['meta_key'];
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$mval = $metarow['meta_value'];
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// Force subkeys to be array type:
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if ( !isset($cache[$mpid]) || !is_array($cache[$mpid]) )
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$cache[$mpid] = array();
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if ( !isset($cache[$mpid][$mkey]) || !is_array($cache[$mpid][$mkey]) )
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$cache[$mpid][$mkey] = array();
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// Add a value to the current pid/key:
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$cache[$mpid][$mkey][] = $mval;
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}
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}
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foreach ( $ids as $id ) {
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if ( ! isset($cache[$id]) )
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$cache[$id] = array();
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}
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foreach ( array_keys($cache) as $object)
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wp_cache_set($object, $cache[$object], $cache_key);
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return $cache;
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}
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/*
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* Given a meta query, generates SQL clauses to be appended to a main query
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*
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* @since 3.1.0
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*
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* @param array $meta_query List of metadata queries. A single query is an associative array:
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* - 'key' string The meta key
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* - 'value' string|array The meta value
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* - 'compare' (optional) string How to compare the key to the value.
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* Possible values: '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN'.
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* Default: '='
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* - 'type' string (optional) The type of the value.
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* Possible values: 'NUMERIC', 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', 'UNSIGNED'.
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* Default: 'CHAR'
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*
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* @param string $meta_type
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* @param string $primary_table
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* @param string $primary_id_column
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* @param object $context (optional) The main query object
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* @return array( 'join' => $join_sql, 'where' => $where_sql )
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*/
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function get_meta_sql( $meta_query, $meta_type, $primary_table, $primary_id_column, $context = null ) {
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global $wpdb;
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if ( ! $meta_table = _get_meta_table( $meta_type ) )
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return false;
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$meta_id_column = esc_sql( $meta_type . '_id' );
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$clauses = array();
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$join = '';
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$where = '';
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$i = 0;
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foreach ( $meta_query as $q ) {
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$meta_key = isset( $q['key'] ) ? trim( $q['key'] ) : '';
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$meta_value = isset( $q['value'] ) ? $q['value'] : '';
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$meta_compare = isset( $q['compare'] ) ? strtoupper( $q['compare'] ) : '=';
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$meta_type = isset( $q['type'] ) ? strtoupper( $q['type'] ) : 'CHAR';
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if ( ! in_array( $meta_compare, array( '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) )
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$meta_compare = '=';
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if ( 'NUMERIC' == $meta_type )
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$meta_type = 'SIGNED';
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elseif ( ! in_array( $meta_type, array( 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', 'UNSIGNED' ) ) )
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$meta_type = 'CHAR';
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if ( empty( $meta_key ) && empty( $meta_value ) )
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continue;
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$alias = $i ? 'mt' . $i : $meta_table;
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$join .= "\nINNER JOIN $meta_table";
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$join .= $i ? " AS $alias" : '';
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$join .= " ON ($primary_table.$primary_id_column = $alias.$meta_id_column)";
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$i++;
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if ( !empty( $meta_key ) )
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$where .= $wpdb->prepare( " AND $alias.meta_key = %s", $meta_key );
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if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) {
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if ( ! is_array( $meta_value ) )
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$meta_value = preg_split( '/[,\s]+/', $meta_value );
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} else {
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$meta_value = trim( $meta_value );
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}
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if ( empty( $meta_value ) )
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continue;
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if ( 'IN' == substr( $meta_compare, -2) ) {
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$meta_field_types = substr( str_repeat( ',%s', count( $meta_value ) ), 1 );
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$meta_compare_string = "($meta_field_types)";
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unset( $meta_field_types );
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} elseif ( 'BETWEEN' == substr( $meta_compare, -7) ) {
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$meta_value = array_slice( $meta_value, 0, 2 );
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$meta_compare_string = '%s AND %s';
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} elseif ( 'LIKE' == substr( $meta_compare, -4 ) ) {
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$meta_value = '%' . like_escape( $meta_value ) . '%';
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$meta_compare_string = '%s';
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} else {
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$meta_compare_string = '%s';
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}
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$where .= $wpdb->prepare( " AND CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$meta_compare_string}", $meta_value );
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unset( $meta_compare_string );
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}
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return apply_filters_ref_array( 'get_meta_sql', array( compact( 'join', 'where' ), $meta_query, $meta_type, $primary_table, $primary_id_column, &$context ) );
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}
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/*
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* Populates the $meta_query property
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*
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* @access private
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* @since 3.1.0
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*
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* @param array $qv The query variables
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*/
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function _parse_meta_query( &$qv ) {
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$meta_query = array();
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// Simple query needs to be first for orderby=meta_value to work correctly
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foreach ( array( 'key', 'value', 'compare', 'type' ) as $key ) {
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if ( !empty( $qv[ "meta_$key" ] ) )
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|
$meta_query[0][ $key ] = $qv[ "meta_$key" ];
|
|
}
|
|
|
|
if ( !empty( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ) {
|
|
$meta_query = array_merge( $meta_query, $qv['meta_query'] );
|
|
}
|
|
|
|
$qv['meta_query'] = $meta_query;
|
|
}
|
|
|
|
/**
|
|
* Retrieve the name of the metadata table for the specified object type.
|
|
*
|
|
* @since 2.9.0
|
|
* @uses $wpdb WordPress database object for queries.
|
|
*
|
|
* @param string $type Type of object to get metadata table for (e.g., comment, post, or user)
|
|
* @return mixed Metadata table name, or false if no metadata table exists
|
|
*/
|
|
function _get_meta_table($type) {
|
|
global $wpdb;
|
|
|
|
$table_name = $type . 'meta';
|
|
|
|
if ( empty($wpdb->$table_name) )
|
|
return false;
|
|
|
|
return $wpdb->$table_name;
|
|
}
|
|
?>
|